| US 7,555,912 B2 | ||
| System for precharging a DC link in a variable speed drive | ||
| Harold Robert Schnetzka, York, Pa. (US); and Ivan Jadric, York, Pa. (US) | ||
| Assigned to York International Corporation, York, Pa. (US) | ||
| Filed on Mar. 07, 2005, as Appl. No. 11/73,830. | ||
| Application 11/073830 is a continuation in part of application No. 11/068999, filed on Mar. 01, 2005, granted, now 7,005,829. | ||
| Prior Publication US 2006/0196203 A1, Sep. 07, 2006 | ||
| Int. Cl. H02P 27/04 (2006.01) | ||
| U.S. Cl. 62—228.4 [318/801; 363/76; 363/77; 363/84] | 20 Claims |
| 1. A variable speed drive comprising:
an inverter module to convert a DC voltage to an AC voltage to power a load;
a DC link to filter and store energy, the DC link being electrically connected in parallel to the inverter module;
a converter module to convert an AC voltage from an AC power source to a DC voltage, the converter module being electrically
connected in parallel to the DC link, the converter module comprising a plurality of pairs of power switches, wherein each
pair of power switches includes a reverse blocking power switch connected in anti-parallel to a silicon carbide controlled
rectifier; and
wherein the converter module is controllable to precharge the DC link.
|